Variety traits

Winter Hardiness — Hypericum inodorum

Hypericum x inodorum Mill.

Hypericum inodorum belongs to USDA hardiness zones 6–9, withstanding temperatures down to –15...–20°C. In temperate climates, the plant exhibits the ability to regenerate its above-ground parts from the root system after frost damage.

In the reference 4 varieties crop Tall tutsan, where this is mentioned in the description.

For Hypericum inodorum, winter hardiness is defined as the ability to survive in the temperature range of USDA zones 6–9, with some forms demonstrating resistance down to zone 4b. According to the Royal Horticultural Society scale, cultivars fall into categories H5 and H6, which corresponds to survival at temperatures from –10°C to –20°C.

The plant is a semi-evergreen or deciduous shrub, whose above-ground part is prone to partial dieback under extreme temperatures. However, the crop possesses a high regenerative capacity, allowing it to sprout from the root in the spring. To increase the survival rate of young plants in regions with cold winters, mulching of the root zone is recommended, and shortening of shoots is applied to maintain ornamental appeal and stimulate spring growth.

General information about the subject — on the page Winter hardiness.

Sources8

Varieties of Tall tutsan mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.